smallclothes

noun[plural only]2

1. •
   Knee-length breeches, worn especially in the 18th century.

   • Even fashions, otherwise convenient, as the trousers that have so long taken place of smallclothes, often perhaps owe their continuance to some general defect . . . — 1841
2. •
   (UK, no longer used) Underwear and other small items of clothing.

   • One hand slid up her thigh and underneath her smallclothes. — 2000